Roundness detection can basically be summarized as two basic types of fixed axis measurement and indeterminate axis measurement. The method of roundness detection with a fixed axis rotation is represented by a roundness meter. Whether it is the rotation of the probe or the object to be tested, there must be a reliable rotating shaft system with certain accuracy requirements to maintain a stable axis of rotation. . Two-point method, three-point method and other roundness detection methods are measurement methods of indeterminate axes, especially the three-point method.
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